The IEEE 802.11 WLAN legacy standard cannot provide QoS support for multimedia
applications. Thus, considerable research efforts have been carried out to
enhance QoS support for 802.11. Among them, 802.11e is the upcoming QoSenhanced
standard proposed by the IEEE working group. This article describes in
detail the new QoS features of 802.11e based on the latest version of the standard
draft. We investigate the performance of 802.11e through computer simulations.
Using simple examples, we show the effectiveness of adaptive schemes
under the 802.11e framework.